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Celestron Omni XLT 150 Manual

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8. Lock the R.A. clamp to prevent the telescope from slipping in R.A. The telescope will track in R.A. as
long as the motor drive is operating.
9. Look through the finderscope to see if you have located the object and center the object in the finder.
10. Look in the main optics and the object should be there. For some of the fainter objects, you may not be
able to see them in the finder. When this happens, it is a good idea to have a star chart of the area so that
you can “star hop” through the field to your target.
This process can be repeated for each object throughout any given night.
U
U
s
s
i
i
n
n
g
g
t
t
h
h
e
e
R
R
.
.
A
A
.
.
V
V
e
e
r
r
n
n
i
i
e
e
r
r
S
S
c
c
a
a
l
l
e
e
To increase the accuracy of the R.A. setting circle, the mount comes with a vernier scale. This device allows
you to get more precise readings down to one minute of right ascension.
Before we go into the specifics on how to use the vernier, let’s take a look at the scale and learn how to read
it. First, the zero (0) mark on the vernier is the R.A. indicator and will hereafter be referred to as such. It is
on the extreme right end of the vernier scale with the other numbers increasing as you move toward the left.
If the R.A. indicator is right on one of the marks of the R.A. setting circle, then that is the coordinate the
telescope is pointing at. The problem arises when the R.A. indicator (zero mark) is in between two of the
marks on the R.A. setting circle. If this is the case you will notice that along the vernier scale, one of the
marks will line up with one of the marks on the setting circle. This mark indicates the number of minutes that
should be added to the R.A. reading of the indicator. Since the indicator is between two R.A. marks, add the
minutes to the lower value that the R.A. indicator falls between.
For example, let’s say the R.A. indicator (zero mark on the vernier) is just left of the 5
h
40
m
mark. This
would place it between the 5
h
40
m
mark and the 5
h
50
m
mark. If you look down the vernier scale, you will
see that the “4” is the only mark to line up with any of the marks on the R.A. setting circle (see Figure 4-11).
This means that you are 4 minutes to the left of the 5
h
and 40
m
mark or more simply at 5
h
and 44
m
.
Figure 4-11 Vernier Scale
Here’s how to use the vernier:
1. Look up the coordinates of the object you want to observe. For our example we will use the Ring Nebula
(M57) which is at 18
h
53
m
right ascension.
2. Release the R.A. clamp and rotate the telescope until the R.A. indicator is between the 18
h
50
m
mark
and the 19
h
00
m
mark on the R.A. setting circle.
3. Lock the R.A. clamp to hold the telescope in place.
4. Move the telescope in R.A. using the slow motion control handle until the three on the vernier scale lines
up with one of the marks on the R.A. setting circle. Remember, the R.A. indicator must stay between
the 18
h
50
m
mark and the 19
h
00
m
mark on the R.A. setting circle!
5. Look through the telescope and the Ring Nebula should be within the field of view if you are using a low
power eyepiece (assuming you have already set the DEC).
… 31 …


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